But today, John McDermott whose brother Joe, 52, was killed in almost identical circumstances in October, 2011, in Litherland, Merseyside, has claimed the law surrounding one-punch killings lies in tatters.

Thug Paul Richards, 33, was jailed for just four years and eight months when he thumped ‘peacemaker’ Joe who was trying to stop the yob from assaulting a woman in the street.

Richards, a serial attacker of women, is set to be a free man next month after serving just half that tariff.

The victim’s brother John, 45, told the Mirror: “These one-punch assaults that cause death are not one-offs.

“There are hundreds of cases like Andrew Young all over Britain.

“They kill a person with one punch and yet the person responsible is back walking the streets within months.

"The government needs to sit up and act to stop killers, in unprovoked attacks, laughing at our legal system.”